Thinning system in package

ABSTRACT

The present application discloses a thinning system in package featuring an encapsulation structure in which no printed circuit board exists and comprising: a plurality of dies mounted on a top face of a copper holder and electrically connected to the plurality of data pins on the copper holder; a passive element mounted on the top face and electrically connected to the dies wherein the dies are electrically connected to the ground pin of the copper holder and both the dies and the passive element are fixed on the top face of the copper holder through a layer of insulation adhesives; a molding compound encasing the dies and the passive element on the top face of the copper holder.

BACKGROUND OF THE INVENTION Field of the Invention

The present application relates to a system in package, particularly an encapsulation structure in which no printed circuit board exists and components are fixed with insulation adhesives for electric conduction based on metal wires or conductive adhesives.

Description of the Prior Art

The existing technology for encapsulation of integrated circuits allows total or most electronic functional configurations in a system or a subsystem to be incorporated in an integral substrate to which dies are connected through the 2D/3D packaging technology and is referred to as the system in package (SiP) for manufacturing processes.

The system in package (SiP) is used to integrate multiple chips and characteristic of one substrate on which a proprietary processor along with DRAMs, flash memories and passive elements are integrated with resistors, capacitors, a connector and an antenna. That is, a complete functional unit can be constructed in a multichip package which is supported by a handful of external components for its functions.

The system in package (SiP) is advantageous in reduction of the system cost compared with the system on a chip (SoC), for example, significantly smaller volume, lighter weight and lower power consumption. However, a SiP-based encapsulated body probably encase dozens of bare chips, all of which could be incapacitated in case of one bare chip malfunctioned, and is produced by a manufacturer through a specifically designed production line for SiP as required or the ratio of manufacturing machines adjusted for optimized utilization efficiency.

There have been several literatures for the system in package (SiP), as disclosed in following patents:

U.S. Ser. No. 15/939,097 discloses system-in-package structures and methods of assembly. In one embodiment, a system-in-package includes opposing circuit boards, each including mounted components overlapping the mounted components of the opposing circuit board. A gap between the opposing circuit boards may be filled with a molding material that additionally encapsulates the overlapping mounted components. In some embodiments, the opposing circuit boards are stacked on one another using one or more interposers that may provide mechanical or electrical connection.

U.S. 61/929,130 discloses a system-in-package module which comprises a non-memory chip, a wrap-around memory and an airtight encapsulation material. The non-memory chip is paired with a plurality of pads; the wrap-around memory comprises a first memory die and a second memory die wherein both the first memory die and the second memory die form at a substrate abreast, the first memory die comprises a first group of pads and the second memory die comprises a second group of pads. The airtight encapsulation material encases the non-memory chip and the wrap-around memory wherein the non-memory chip is electrically coupled to the wrap-around memory through the plurality of pads, the first group of pads and the second group of pads. The first group of pads turned a default angle or being under mirror mapping correspond to the second group of pads.

TW 201737452 discloses a system in package (SiP), which includes: a RDL structure; a first semiconductor die mounted on the first side of the RDL structure and having an active surface directly contacting with the RDL structure; a plurality of conductive fingers on the first side of the RDL structure around the first semiconductor die; a second semiconductor die stacked on the first semiconductor die directly and electrically connected to the plurality of conductive fingers through a plurality of bond wires; a mold cap encapsulating the first semiconductor die, the conductive fingers, the second semiconductor die and the first side of the RDL structure. In addition, TW 201737452 also discloses a method to fabricate a system in package for routing flexibility

However, a manufacturer for chip encapsulation in severe market competitions withstands intense pressures like further reduction of manufacturing cost and scaling-down of volume/weight. Thus, how to effectuate and maintain reliability of encapsulated dies is a tough issue for a manufacturer.

SUMMARY OF THE INVENTION

In virtue of the above issues, a system in package provided in the present disclosure is characteristic of an encapsulation structure in which no printed circuit board exists for the overall cost reduced remarkably.

Accordingly, a system in package provided in the present disclosure is characteristic of removal of a printed circuit board for thinning an encapsulation structure.

A system in package provided in the present disclosure accommodates multiple layers inside a thinned encapsulation structure for additions of miscellaneous functions.

A system in package provided in the present disclosure is characteristic of electronic components fixed with insulation adhesives for reductions of a setup cost and an overall thickness.

A system in package provided in the present disclosure is characteristic of electric conduction between electronic components through conductive adhesives for reduction of a setup cost and promotion of electrical efficiency.

A system in package provided in the present disclosure is characteristic of direct electric conduction through metal wires for promotion of electrical performance and reduction in output of waste heat.

To this end, the major technical measures in the present application are embodied according to the following technical solution. In the present disclosure, a thinning system in package with no printed circuit board inside an encapsulation structure comprises: a copper holder with a plurality of data pins and at least a ground pin; a plurality of dies mounted on the top face of the copper holder and electrically connected to the data pins of the copper holder; at least a passive element mounted on the top face of the copper holder and electrically connected to the dies wherein both the dies and the passive element are fixed on the top face of the copper holder through a layer of insulation adhesives and the dies are electrically connected to the ground pin of the copper holder; a molding compound encasing the dies and the passive element on the top face of the copper holder.

The purposes and technical issues in the present disclosure are further embodied by referring to the following technical measures.

In the above thinning system in package, the dies are electrically connected to the data pins of the copper holder through a plurality of first metal wires.

In the above thinning system in package, the passive element is electrically connected to the dies through a plurality of second metal wires.

In the above thinning system in package, the dies are electrically connected to the data pins of the copper holder through a layer of conductive adhesives.

In the above thinning system in package, the dies are electrically connected to the ground pin of the copper holder through a layer of conductive adhesives.

In the above thinning system in package, the dies are electrically connected to the ground pin of the copper holder through a plurality of third metal wires.

In the above thinning system in package, the passive element is electrically connected to the data pins of the copper holder through a layer of conductive adhesives.

In the above thinning system in package, the passive element is electrically connected to the ground pin of the copper holder through a layer of conductive adhesives.

In the above thinning system in package, the passive element is electrically connected to the data pins of the copper holder through at least a fourth metal wire.

In the above thinning system in package, the passive element is electrically connected to the ground pin of the copper holder through at least a fifth metal wire.

In contrast to the prior art, a thinning system in package in the present disclosure proves effective in: (1) replacing a printed circuit board by metal wires for an overall cost reduced remarkably; (2) fixing electronic components with insulation adhesives for reductions of a setup cost and an overall thickness; (3) conducting electronic components through conductive adhesives for reduction of a setup cost and promotion of electrical efficiency.

BRIEF DESCRIPTIONS OF THE DRAWINGS

FIG. 1 is a schematic view of a thinning system in package in the first embodiment.

FIG. 2 a is a schematic view of a thinning system in package in the second embodiment.

FIG. 2 b is a schematic view of a thinning system in package in the third embodiment.

FIG. 2 c is a schematic view of a thinning system in package in the fourth embodiment.

FIG. 2 d is a schematic view of a thinning system in package in the fifth embodiment.

FIG. 2 e is a schematic view of a thinning system in package in the sixth embodiment.

FIG. 2 f is a schematic view of a thinning system in package in the seventh embodiment.

FIG. 3 is a schematic view of a thinning system in package for electrical connection in the first embodiment.

FIG. 4 a is a schematic view of a thinning system in package for electrical connection in the second embodiment.

FIG. 4 b is a schematic view of a thinning system in package for electrical connection in the third embodiment.

FIG. 4 c is a schematic view of a thinning system in package for electrical connection in the fourth embodiment.

FIG. 4 d is a schematic view of a thinning system in package for electrical connection in the fifth embodiment.

FIG. 4 e is a schematic view of a thinning system in package for electrical connection in the sixth embodiment.

FIG. 4 f is a schematic view of a thinning system in package for electrical connection in the seventh embodiment.

DETAILED DESCRIPTIONS OF THE PREFERRED EMBODIMENTS

A thinning system in package is explained in the preferred embodiments for clear understanding of purposes, characteristics and effects of the present application.

FIGS. 1 and 3 illustrate a system in package in the first embodiment. Referring to FIG. 1 , which illustrates a thinning system in package with no printed circuit board existing comprises: a copper holder (10) with a plurality of data pins (11) and at least a ground pin (12); a plurality of dies (20, 20′) mounted on a top face (13) of the copper holder (10) and electrically connected to the data pins (11) of the copper holder (10); at least a passive element (40) mounted on the top face (13) of the copper holder (10) and electrically connected to the dies (20, 20′) wherein both the dies (20, 20′) and the passive element (40) are fixed on the top face (13) of the copper holder (10) through a layer of insulation adhesives (52) and the dies (20, 20′) are electrically connected to the ground pin (12) of the copper holder (10); a molding compound (50) used to encase both the dies (20, 20′) and the passive element (40) on the top face (13) of the copper holder (10).

Specifically, the die (20) is electrically connected to the data pins (11) of the copper holder (10) through a first metal wire (30), the passive element (40) is electrically connected to the die (20) through a second metal wire (31), and the die (20) is electrically connected to the ground pin (12) of the copper holder (10) through a third metal wire (32).

In practice, the die (20) is electrically connected to the data pins (11) partly through a plurality of first metal wires (30), the passive element (40) is electrically connected to the die (20) partly through the second metal wire (31), and the die (20) is electrically connected to the ground pin (12) partly through the third metal wire (32).

In detail, the copper holder (10) is a lead frame, which is manufactured as a metal structure for encapsulation of a die inside and used to transmit signals from a die to the outside, and consists of different sections such that all components are fixed inside a frame structure by structural connections for automated processing in a lead-wire frame easily; moreover, the data pins (11) are effective in electrical connections between the die (20) and the outside; the ground pin (12) is an earth lead as a zero potential reference in a circuit design generally and also a reference potential of a whole circuit, that is, 0V at the earth lead for the uniform electrical potential in a whole circuit; the insulation adhesives (52), which are non-conductive colloidal substances for sticking objects, will be cured after change in quality for keeping objects fixed and non-conductive.

The dies (20, 20′) are miniature semiconductor-based integrated circuit bodies which are cut from a wafer and not encapsulated; in a thinning system in package, a first metal wire (30), a second metal wire (31) and a third metal wire (32) are metal wires for wire bonding that is a technology to link a die and a lead frame by metal wires featuring wire diameters from 15 to 50 μm for communication between a miniature die and an outside circuit without extra areas; the passive element (40) is a passive component or a passive device which is an electronic device consuming but not generating energy or producing no gain; the molding compound (50) is a semiconductor encapsulating material based on common polymer resins for electronic components and chips.

Referring to FIG. 3 , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 a and 4 a , which illustrate a system in package in the second embodiment. In the second embodiment different from the first embodiment, the die (20) is electrically connected to the ground pin (12) through conductive adhesives (51) in between. Referring to FIG. 2 a , which illustrates the dies (20, 20′) are electrically connected to the data pins (11) of the copper holder (10) through a layer of conductive adhesives (51).

Specifically, the conductive adhesives (51), which are conductive colloidal substances for sticking objects, will be cured after change in quality for keeping objects fixed and conductive.

In practice, the die (20) and the ground pin (12) between which the conductive adhesives (51) are filled are electrically connected to each other partly; furthermore, as shown in the first embodiment, the die (20) is electrically connected to the ground pin (12) partly through the third metal wire (32). In a practical manufacturing process, the insulation adhesives (52) are first coated on the top face (13) of the copper holder (10) and the conductive adhesives (51) are applied on the surface of the cured insulation adhesives (52).

Referring to FIG. 4 a , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the passive element (40) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through a layer of conductive adhesives (51); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 b and 4 b , which illustrate a system in package in the third embodiment. In the third embodiment different from the first embodiment, the conductive adhesives (51) are added for electrical connection. Referring to FIG. 2 b , which illustrates the die (20) is electrically connected to the data pins (11) of the copper holder (10) through a layer of conductive adhesives (51).

Referring to FIG. 4 b , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) partly through the first metal wire (30) and also electrically connected to the data pin (11) of the copper holder (10) partly through the conductive adhesives (51) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 c and 4 c , which illustrate a system in package in the fourth embodiment. In the fourth embodiment different from the first embodiment, the conductive adhesives (51) are added for electrical connection. Referring to FIG. 2 c , which illustrates the passive element (40) is electrically connected to the data pins (11) of the copper holder (10) through a layer of conductive adhesives (51).

Referring to FIG. 4 c , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the passive element (40) is electrically connected to the data pin (11) partly through the conductive adhesives (51); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), trough the second metal wire (31); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 d and 4 d , which illustrate a system in package in the fifth embodiment. In the fifth embodiment different from the first embodiment, the conductive adhesives (51) are added. Referring to FIG. 2 d , which illustrates the passive element (40) is electrically connected to the ground pin (12) of the copper holder (10) through a layer of conductive adhesives (51).

Specifically, the passive element (40) can be a grounded resistor or a grounded capacitor, each of which should be electrically connected to the ground pin (12) additionally.

Referring to FIG. 4 d , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the passive element (40) is electrically connected to the ground pin (12) through the conductive adhesives (51); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 e and 4 e , which illustrate a system in package in the sixth embodiment. In the sixth embodiment different from the third embodiment, a fourth metal wire (33) is added for electrical connection. Referring to FIG. 2 e , which illustrates the passive element (40) is electrically connected to the data pins (11) of the copper holder (10) through at least a fourth metal wire (33).

Specifically, the fourth metal wire (33) is a metal wire for wire bonding that is a technology to link a die and a lead frame by metal wires featuring wire diameters from 15 to 50 μm for communication between a miniature die and an outside circuit without extra areas.

Referring to FIG. 4 e , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) and also electrically connected to the data pin (11) of the copper holder (10) through the conductive adhesives (51) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the passive element (40) is electrically connected to the data pin (11) partly through the fourth metal wire (33); the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the die (20) is further paired with a memory component in practice.

Referring to FIGS. 2 f and 4 f , which illustrate a system in package in the seventh embodiment. In the seventh embodiment different from the third embodiment, a fifth metal wire (34) is added for electrical connection. Referring to FIG. 2 f , which illustrates the passive element (40) is electrically connected to the ground pin (12) of the copper holder (10) through at least a fifth metal wire (34).

Specifically, the fifth metal wire (34) is a metal wire for wire bonding that is a technology to link a die and a lead frame by metal wires featuring wire diameters from 15 to 50 μm for communication between a miniature die and an outside circuit without extra areas.

Referring to FIG. 4 f , which illustrates the die (20) is electrically connected to the data pin (11), the ground pin (12) and the passive element (40), respectively, wherein: the die (20) is electrically connected to the data pin (11) through the first metal wire (30) and also electrically connected to the data pin (11) of the copper holder (10) through the conductive adhesives (51) such that electric conduction between outside signals/power and the die (20) is created and signals are transmitted to the outside; the passive element (40) is electrically connected to the ground pin (12) partly through the fifth metal wire (34); the die (20) is electrically connected to the ground pin (12), which is taken as a zero potential reference and also a reference potential of a whole circuit, that is, 0V at the ground pin (12) for the uniform electrical potential in a whole circuit, through the third metal wire (32); the die (20) is electrically connected to the passive element (40), which can be a quartz crystal unit (or Xtal), a resistor, a capacitor or an inductor to support operation of the die (20), through the second metal wire (31); the die (20) is further paired with a memory component in practice.

Accordingly, a thinning system in package which is different from other semiconductor packaging structures and referred to as creative work in applications of semiconductor encapsulation meets patentability and is applied for the patent.

It should be reiterated that the above descriptions present the preferred embodiments of a thinning system in package and any equivalent changes or modifications in specifications, claims or drawings still belongs to the technical field within the present disclosure with reference to claims hereinafter. 

What is claimed is:
 1. A thinning system in package featuring an encapsulation structure in which no printed circuit board exist and comprising: a copper holder with a plurality of data pins and at least a ground pin; a plurality of dies mounted on the top face of the copper holder and electrically connected to the data pins of the copper holder; at least a passive element mounted on the top face of the copper holder and electrically connected to the dies wherein both the dies and the passive element are fixed on the top face of the copper holder through a layer of insulation adhesives and the dies are electrically connected to the ground pin of the copper holder; a molding compound encasing the dies and the passive element on the top face of the copper holder.
 2. The thinning system in package as claimed in claim 1 wherein the dies are electrically connected to the data pins of the copper holder through a plurality of first metal wires.
 3. The thinning system in package as claimed in claim 1 wherein the passive element is electrically connected to the dies through a plurality of second metal wires.
 4. The thinning system in package as claimed in claim 1 wherein the dies are electrically connected to the data pins of the copper holder through a layer of conductive adhesives.
 5. The thinning system in package as claimed in claim 1 wherein the dies are electrically connected to the ground pin of the copper holder through a layer of conductive adhesives.
 6. The thinning system in package as claimed in claim 1 wherein the dies are electrically connected to the ground pin of the copper holder through a plurality of third metal wires.
 7. The thinning system in package as claimed in claim 1 wherein the passive element is electrically connected to the data pins of the copper holder through a layer of conductive adhesives.
 8. The thinning system in package as claimed in claim 1 wherein the passive element is electrically connected to the ground pin of the copper holder through a layer of conductive adhesives.
 9. The thinning system in package as claimed in claim 1 wherein the passive element is electrically connected to the data pins of the copper holder through at least a fourth metal wire.
 10. The thinning system in package as claimed in claim 1 wherein the passive element is electrically connected to the ground pin of the copper holder through at least a fifth metal wire. 